public static void main(String[] args) throws Exception {
PrintStream out = System.out;
out.println(test(10000));
}
@Test
public void canFollowLogfile() throws IOException {
File tempFile =
File.createTempFile("commons-io", "", new File(System.getProperty("java.io.tmpdir")));
tempFile.deleteOnExit();
System.out.println("Temp file = " + tempFile.getAbsolutePath());
PrintStream log = new PrintStream(tempFile);
LogfileFollower follower = new LogfileFollower(tempFile);
List<String> lines;
// Empty file:
lines = follower.newLines();
assertEquals(0, lines.size());
// Write two lines:
log.println("Line 1");
log.println("Line 2");
lines = follower.newLines();
assertEquals(2, lines.size());
assertEquals("Line 2", lines.get(1));
// Write one more line:
log.println("Line 3");
lines = follower.newLines();
assertEquals(1, lines.size());
assertEquals("Line 3", lines.get(0));
// Write one and a half line and finish later:
log.println("Line 4");
log.print("Line 5 begin");
lines = follower.newLines();
assertEquals(1, lines.size());
// End last line and start a new one:
log.println(" end");
log.print("Line 6 begin");
lines = follower.newLines();
assertEquals(1, lines.size());
assertEquals("Line 5 begin end", lines.get(0));
// End last line:
log.println(" end");
lines = follower.newLines();
assertEquals(1, lines.size());
assertEquals("Line 6 begin end", lines.get(0));
// A line only missing a newline:
log.print("Line 7");
lines = follower.newLines();
assertEquals(0, lines.size());
log.println();
lines = follower.newLines();
assertEquals(1, lines.size());
assertEquals("Line 7", lines.get(0));
// Delete:
log.close();
lines = follower.newLines();
assertEquals(0, lines.size());
}
private static void doPrint(int n) {
PrintStream out = System.out;
for (int i = 0; i < n; i++) {
out.print('x');
}
}